发明名称 |
Tracking servo system for optical-disc information reproducing apparatus |
摘要 |
A tracking servo system for an optical-disc information reproducing apparatus includes (a) a light source for generating a light beam to scan a target track on an optical-disc wherein the information is stored as a series of pits arranged in the form of the track; (b) four photodetectors, arranged in two pairs with each pair intersecting the other and being disposed in a direction oblique to an image of the track for converting an image of the pit into respective electric signals; (c) a circuit for comparing the phases of the electric signals and for producing a tracking error signal ranging in accordance with the phase difference between the electric signals; and (d) a motor and lens for deflecting the light beam along a path perpendicular to the target track in response to the tracking error signal, whereby the light beam accurately scans the target track.
|
申请公布号 |
US4520469(A) |
申请公布日期 |
1985.05.28 |
申请号 |
US19830471648 |
申请日期 |
1983.03.03 |
申请人 |
TOKYO SHIBAURA DENKI KABUSHIKI KAISHA |
发明人 |
TODOKORO, SHIGERU;NAKANE, HIROSHI;MAEDA, SATORU |
分类号 |
G11B7/09;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/09 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|